PDF malware analysis — malicious · 26200a7c54c52765

MALICIOUS

PDF

26.3 KB Created: 2011-72-51 03:25:00 Authoring application: String.fromCharCode

MD5: bdb3b473edb5ec8bcdc931edb6af148c SHA-1: 93d926d272f60c903a6b3b75783be512e6748a4e SHA-256: 26200a7c54c5276509401d725557e81f08ecbdcb3f69aabc442af3d5439578d8

96 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 Command and Scripting Interpreter: PowerShell T1059.003 Command and Scripting Interpreter: Windows Command Shell T1204.002 Malicious File: User Execution: Malicious File

The PDF file contains embedded JavaScript, indicated by multiple heuristic firings including PDF_JAVASCRIPT, PDF_JS, and PDF_FROMCHARCODE. The presence of a high-confidence ML_NYX_PDF_MALICIOUS flag and a PDF_EVAL call suggests the JavaScript is designed to execute arbitrary code. The extracted artifact 'javascript_obj0001_000.js' is likely the source of this malicious script, which is commonly used to download and execute further stages of malware. The file's metadata indicates it was authored using 'String.fromCharCode', a common technique for obfuscating JavaScript.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 5

eval() call high PDF_EVAL

eval() found — commonly used for obfuscated exploit execution (matched inside decoded stream)
JavaScript action low PDF_JAVASCRIPT

PDF contains a /JavaScript action. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
Embedded JS stream low PDF_JS

PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
String.fromCharCode low PDF_FROMCHARCODE

String.fromCharCode found — used to construct payload strings dynamically. Common in benign JavaScript libraries for codepoint manipulation, so this alone is informational; weaponised use is also caught by the dedicated fromCharCode-stage and exploit-shape rules.
Suspicious extracted artifact info EXTRACTED_FILE_STATIC_TRIAGE

One or more files extracted from inside this sample matched static suspicious-content checks such as script obfuscation, encoded payload blobs, packed data, or execution/download terms.

Extracted artifacts 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0001_000.js` `620d6127405e6cbc6e7f358f1d0c3c68ae49f58ee96cfd04e6a69d1592360219`	pdf-javascript-stream	PDF /JS object 1 at offset 0xA	931 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).

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